It is almost exactly a year to the day that we took Otter to a top orthodog consultant. Based on the experience we have had with both Otter and Benson by "jobbing vets" .... now I am not inferring there is anything wrong with that, but personally I would go straight for the referral to the best orthdog you can find, have all the joints Xrayed or scanned, with a thorough plan devised based on really understanding exactly what his joints look like.
A diagnoses of OCD was originally floated for Otter, but on Xray we found this not to be the case.